I have a 2004 Dodge Grand Caravan 3.8 engine with 110,000 miles. Check engine came on with a code PO480 and now my radiator fans will not come on.
Both fans are suppose to come on by one solid state relay that is mounted behind the grill in front of the radiator.
My scanner is old, I was able to get the code and it gave me some data. It showed engine temperature climbing normal with my scanner so I suspect my temperature sensor is working good.
I jumped the connector for fan power and both fans came on, so the fans and fuses are good.
I tried to put control power from the battery to the relay and it would not close the switch. I’m not sure what kind of power the relay should get, pulsed, 5v, 12v? Anyway it did not close, I went out and bought a new relay from Autozone, installed and no change.
I tried to measure relay control voltage at the connector and got 0 on my digital meter.
I ohm the wire from the relay to the integrated control module and have continuity. I believe there is still a wire from the intergrated control module to the power train control module, however I don’t know where the power train control module is?
I also returned the solid state relay back to Autozone in case it was a new defect, but still no change. Its just a relay, you would think I can put the correct voltage and it would close my contacts. Anyone know what the relay control voltage is? Or where the power train control module is located?
Anyone know what I’m missing, or where to go next? Any help would be greatly appreciated.
Is my old bud Tester still on this site?